公开(公告)号：CA2864182A1

公开(公告)日：2013-11-21

申请号：CA2864182

申请日：2013-04-12

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CHIN HERBERT A ,  OGDEN WILLIAM P ,  HALUCK DAVID A ,  MCCUTCHAN SEAN ,  SPITZER RONALD F ,  KELLER ALLEN V

IPC: B24B39/04 ,  C21D1/76 ,  C21D9/36

Abstract: A method of treating bearing rolling elements or bearing rings after a hardening and temper heat treatment is disclosed. The method may include treating the bearing rolling elements in a tumbling treatment and then in a duplex hardening treatment. The method may include treating the bearing rings in a peening treatment and then in a duplex hardening treatment. The duplex hardening treatment may also include at least one sequential process segment consisting of subjecting the bearing rolling element & rings to a nitriding process to increase the surface hardness and compressive residual stress. The combined two-step process produces a deep surface/sub-surface residual stress greater than the depth of the maximum operating von-Mises shear stress along with an ultra-hard surface with high magnitude of compressive residual stress. In so doing, the bearing ring and rolling elements will have significantly enhanced rolling contact fatigue resistance and resistance to surface imperfections and debris.

公开(公告)号：CA2864182C

公开(公告)日：2020-06-30

申请号：CA2864182

申请日：2013-04-12

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CHIN HERBERT A ,  OGDEN WILLIAM P ,  HALUCK DAVID A ,  MCCUTCHAN SEAN ,  SPITZER RONALD F ,  KELLER ALLEN V

IPC: B24B39/04 ,  C21D1/76 ,  C21D9/36

Abstract: A method of treating bearing rolling elements or bearing rings after a hardening and temper heat treatment is disclosed. The method may include treating the bearing rolling elements in a tumbling treatment and then in a duplex hardening treatment. The method may include treating the bearing rings in a peening treatment and then in a duplex hardening treatment. The duplex hardening treatment may also include at least one sequential process segment consisting of subjecting the bearing rolling element & rings to a nitriding process to increase the surface hardness and compressive residual stress. The combined two-step process produces a deep surface/sub-surface residual stress greater than the depth of the maximum operating von-Mises shear stress along with an ultra-hard surface with high magnitude of compressive residual stress. In so doing, the bearing ring and rolling elements will have significantly enhanced rolling contact fatigue resistance and resistance to surface imperfections and debris.

公开(公告)号：DE602005013320D1

公开(公告)日：2009-04-30

申请号：DE602005013320

申请日：2005-05-11

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CHIN HERBERT A ,  OGDEN WILLIAM P ,  HALUCK DAVID A

IPC: C23C8/32 ,  C21D1/06 ,  C21D6/00 ,  C21D9/32 ,  C21D9/40 ,  C22C38/00 ,  C22C38/30 ,  C22C38/58

Abstract: A carbo-nitriding process for forming a martensitic stainless steel, which is case hardened and superior corrosion resistance over carburized process, is provided. A process for forming a martensitic stainless steel which is case hardened is provided. The process comprises the steps of providing a material consisting essentially of from 8.0 to 18 wt% chromium, cobalt up to 16 wt%, vanadium up to 5.0 wt%, molybdenum up to 8.0 wt%, nickel up to 8.0 wt%, manganese up to 4.0 wt%, silicon up to 2.0 wt%, tungsten up to 6.0 wt%, titanium up to 2.0 wt%, niobium up to 4.0 wt% and the balance iron, and carbo-nitriding to prescribed levels of C + N, to form a hard, corrosion resistance case in a fracture tough stainless steel.

公开(公告)号：EP3074542A4

公开(公告)日：2017-11-29

申请号：EP14863663

申请日：2014-11-24

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CHIN HERBERT A ,  HALUCK DAVID A ,  OGDEN WILLIAM P ,  MOULIN MICHAEL A

IPC: C21D1/06

CPC classification number: C21D9/38 ,  C21D1/06 ,  C21D6/002 ,  C21D7/13 ,  C21D2211/008 ,  C23C8/02 ,  C23C8/22 ,  C23C8/32 ,  F16C33/32 ,  F16C33/34 ,  F16C33/62 ,  F16C2204/72 ,  F16C2223/12 ,  F16C2223/16

Abstract: A method for cost effectively case hardening a component formed from a martensitic stainless steel material with a desired metallurgical condition for high temperature, high rolling contact fatigue, corrosion and spall initiation and propagation resistance bearing performance. The method describes a method to significantly reduce the carburization or carbo-nitriding process times for appreciable reduction in manufacturing cost. The Method includes the steps of: forming the component from a martensitic stainless steel material having an ASTM grain size of 9 or finer; and subjecting the component to one of a carburization and a carbo-nitriding treatment with significantly lower case hardening times for manufacturing cost-effectiveness.

公开(公告)号：EP2971210A4

公开(公告)日：2016-11-16

申请号：EP14764684

申请日：2014-01-15

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CHIN HERBERT A ,  OGDEN WILLIAM P ,  HALUCK DAVID A ,  SPITZER RONALD F

IPC: C22C38/00 ,  F16C33/44 ,  F16C33/56 ,  F16C33/62

CPC classification number: F16C33/62 ,  C21D6/002 ,  C21D9/36 ,  C21D9/40 ,  C22C38/00 ,  C22C38/02 ,  C22C38/22 ,  C22C38/24 ,  C22C38/30 ,  C22C38/38 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/58 ,  C23C8/22 ,  C23C8/26 ,  C23C8/32 ,  C23C8/38 ,  F16C19/02 ,  F16C33/32 ,  F16C2202/04 ,  F16C2204/72 ,  F16C2206/58 ,  F16C2240/18 ,  F16C2240/40 ,  F16C2240/48 ,  F16C2360/23

Abstract: A rolling element bearing includes a plurality of bearing components, which include one or more rolling elements, an inner ring and an outer ring. A first of the bearing components includes martensitic stainless steel configured with a core and a hardened case. The martensitic stainless steel of the core includes approximately 8% by weight or more chromium. The martensitic stainless steel of the hardened case has a grain size that is substantially equal to or finer than ASTM grain size #7. The martensitic stainless steel of the hardened case includes approximately 6% by weight or more chromium, and carbon. Molecules that include the carbon are substantially uniformly dispersed within the hardened case.

公开(公告)号：EP2849920A4

公开(公告)日：2016-06-01

申请号：EP13790177

申请日：2013-04-12

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CHIN HERBERT A ,  OGDEN WILLIAM P ,  HALUCK DAVID A ,  MCCUTCHAN SEAN ,  SPITZER RONALD F ,  KELLER ALLEN V

IPC: B24B39/04 ,  C21D1/76 ,  C21D9/36 ,  C23C8/26 ,  C23C8/50 ,  F16C33/12

CPC classification number: C21D7/06 ,  B24B1/00 ,  B24B11/02 ,  B24B19/06 ,  B24B31/02 ,  C21D1/76 ,  C21D9/36 ,  C21D9/40 ,  C23C8/02 ,  C23C8/26 ,  C23C8/36 ,  C23C8/50 ,  C23C8/80 ,  F16C33/32 ,  F16C2223/02 ,  F16C2223/10 ,  F16C2240/18 ,  F16C2360/23 ,  Y02P10/212 ,  Y10T29/47

Abstract: A method of treating bearing rolling elements or bearing rings after a hardening and temper heat treatment is disclosed. The method may include treating the bearing rolling elements in a tumbling treatment and then in a duplex hardening treatment. The method may include treating the bearing rings in a peening treatment and then in a duplex hardening treatment. The duplex hardening treatment may also include at least one sequential process segment consisting of subjecting the bearing rolling element & rings to a nitriding process to increase the surface hardness and compressive residual stress. The combined two-step process produces a deep surface/sub-surface residual stress greater than the depth of the maximum operating von-Mises shear stress along with an ultra-hard surface with high magnitude of compressive residual stress. In so doing, the bearing ring and rolling elements will have significantly enhanced rolling contact fatigue resistance and resistance to surface imperfections and debris.